/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.core5.http.impl.io;
  
  import java.io.IOException;
  import java.io.InputStream;
  import java.io.OutputStream;
  import java.net.Socket;
  import java.util.concurrent.atomic.AtomicReference;
  
  import org.apache.hc.core5.util.Args;
  
  /**
   * Utility class that holds a {@link Socket} along with copies of its {@link InputStream}
   * and {@link OutputStream}.
   *
   * @since 5.0
   */
  public class SocketHolder {
  
      private final Socket socket;
      private final AtomicReference<InputStream> inputStreamRef;
      private final AtomicReference<OutputStream> outputStreamRef;
  
      public SocketHolder(final Socket socket) {
          this.socket = Args.notNull(socket, "Socket");
          this.inputStreamRef = new AtomicReference<>();
          this.outputStreamRef = new AtomicReference<>();
      }
  
      public final Socket getSocket() {
          return socket;
      }
  
      public final InputStream getInputStream() throws IOException {
          InputStream local = inputStreamRef.get();
          if (local != null) {
              return local;
          }
          local = getInputStream(socket);
          if (inputStreamRef.compareAndSet(null, local)) {
              return local;
          }
          return inputStreamRef.get();
      }
  
      protected InputStream getInputStream(final Socket socket) throws IOException {
          return socket.getInputStream();
      }
  
      protected OutputStream getOutputStream(final Socket socket) throws IOException {
          return socket.getOutputStream();
      }
  
      public final OutputStream getOutputStream() throws IOException {
          OutputStream local = outputStreamRef.get();
          if (local != null) {
              return local;
          }
          local = getOutputStream(socket);
          if (outputStreamRef.compareAndSet(null, local)) {
              return local;
          }
          return outputStreamRef.get();
      }
  
      @Override
      public String toString() {
          return socket.toString();
      }
  
  }